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D( i )
3*i+1 = 0
3*i+1 = 0
3*i+1 = 0
3*i+1 = 0 // - 1
3*i = -1 // : 3
i = -1/3
i in (-oo:-1/3) U (-1/3:+oo)
1/(3*i+1) = 0
i belongs to the empty set
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